The DR Trimmer Mower is much easier to control than a handheld trimmer, but its extra power can cause damage in sensitive areas around trees, garden borders, against wooden siding or fence posts. The TrimSafe Guard attachment will prevent accidental girdling of trees or any other unintended damage without slowing you down. The tips of a full length cord are inset 1″ from the outer bar. Attaching the TrimSafe Guard to your DR Trimmer Mower requires removing the two head assembly bolts and attaching the mounting plate. Once the mounting plate has been installed, the tree guard goes on and off using two pins, which takes less than a few minutes. Mounting bolts and pins included.